18278142 has 16 divisors (see below), whose sum is σ = 36769680. Its totient is φ = 6057152.

The previous prime is 18278131. The next prime is 18278147. The reversal of 18278142 is 24187281.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18278147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7767 + ... + 9842.

It is an arithmetic number, because the mean of its divisors is an integer number (2298105).

Almost surely, 2^18278142 is an apocalyptic number.

18278142 is an abundant number, since it is smaller than the sum of its proper divisors (18491538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18278142 is a wasteful number, since it uses less digits than its factorization.

18278142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17787.

The product of its digits is 7168, while the sum is 33.

The square root of 18278142 is about 4275.2943758296. The cubic root of 18278142 is about 263.4171311939.

The spelling of 18278142 in words is "eighteen million, two hundred seventy-eight thousand, one hundred forty-two".